After this, we do cry and column with the following formula.

( r x c ) x ( r – 1 ) x ( c – 1 ) + ( r – 2 ) x ( c – 2 )………0

### Count of rectangle and quadrilaterals

For counting rectangles and quadrilateral shapes, we will use a second formula, which is how we calculate rows and columns

First thing in the first formula

First thing in the first formula

### [( r ) + (r -1 ) + ( r-2) +(r-3) …..0] x [ ( c ) +(c-1)+(c-2)+(c-3)…..0]

This formula is used only for that rectangle and quadrilateral, whose shape is made of columns and birds, the quadrilateral divides into equal parts

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**Count of triangle**

In the count of triangles, we start the first one and work the triangle equally, after which the cart number is added, this is the number of askingWatch the video

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**Count of shells**

We do not have any type of formula for counting of the balls, we normally do one by one, from small to large, which is stated in the video.**Watch the video**